356 lines
8.2 KiB
C
356 lines
8.2 KiB
C
/*
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* driver.c - U-Boot driver model
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*
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* Copyright (c) 2007 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <common.h>
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#include <command.h>
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#include <driver.h>
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#include <malloc.h>
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#include <linux/ctype.h>
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#include <errno.h>
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#include <fs.h>
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static struct device_d *first_device = NULL;
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static struct driver_d *first_driver = NULL;
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struct device_d *get_first_device(void)
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{
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return first_device;
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}
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struct device_d *get_device_by_id(const char *_id)
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{
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struct device_d *d;
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char *id, *colon;
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/* FIXME: is this still needed? */
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id = strdup(_id);
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if ((colon = strchr(id, ':')))
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*colon = 0;
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d = first_device;
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while(d) {
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if(!strcmp(id, d->id))
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break;
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d = d->next;
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}
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free(id);
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return d;
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}
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int get_free_deviceid(char *id, char *id_template)
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{
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int i = 0;
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while (1) {
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sprintf(id, "%s%d", id_template, i);
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if (!get_device_by_id(id))
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return 0;
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i++;
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};
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return -1;
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}
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static int match(struct driver_d *drv, struct device_d *dev)
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{
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if (strcmp(dev->name, drv->name))
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return -1;
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if (dev->type != drv->type)
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return -1;
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if(drv->probe(dev))
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return -1;
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dev->driver = drv;
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return 0;
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}
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int register_device(struct device_d *new_device)
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{
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struct driver_d *drv;
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struct device_d *dev;
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dev = first_device;
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if(*new_device->id && get_device_by_id(new_device->id)) {
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printf("device %s already exists\n", new_device->id);
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return -EINVAL;
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}
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// printf("register_device: %s\n",new_device->name);
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if(!dev) {
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first_device = new_device;
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dev = first_device;
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} else {
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while(dev->next)
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dev = dev->next;
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}
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dev->next = new_device;
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new_device->next = 0;
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drv = first_driver;
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while(drv) {
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if (!match(drv, new_device))
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break;
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drv = drv->next;
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}
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return 0;
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}
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void unregister_device(struct device_d *old_dev)
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{
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struct device_d *dev;
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// printf("unregister_device: %s\n",old_dev->name);
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dev = first_device;
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while (dev) {
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if (!strcmp(dev->next->name, old_dev->name)) {
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if (old_dev->driver)
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old_dev->driver->remove(old_dev);
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dev->next = old_dev->next;
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return;
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}
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dev = dev->next;
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}
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}
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struct driver_d *get_driver_by_name(const char *name)
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{
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struct driver_d *d;
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d = first_driver;
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while(d) {
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if(!strcmp(name, d->name))
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break;
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d = d->next;
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}
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return d;
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}
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static void noinfo(struct device_d *dev)
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{
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printf("no info available for %s\n", dev->id);
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}
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static void noshortinfo(struct device_d *dev)
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{
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}
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int register_driver(struct driver_d *new_driver)
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{
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struct driver_d *drv;
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struct device_d *dev = NULL;
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drv = first_driver;
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// printf("register_driver: %s\n",new_driver->name);
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if(!drv) {
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first_driver = new_driver;
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drv = first_driver;
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} else {
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while(drv->next)
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drv = drv->next;
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}
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drv->next = new_driver;
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new_driver->next = 0;
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if (!new_driver->info)
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new_driver->info = noinfo;
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if (!new_driver->shortinfo)
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new_driver->shortinfo = noshortinfo;
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dev = first_device;
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while (dev) {
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match(new_driver, dev);
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dev = dev->next;
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}
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return 0;
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}
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static char devicename_from_spec_str_buf[PATH_MAX];
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char *deviceid_from_spec_str(const char *str, char **endp)
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{
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char *buf = devicename_from_spec_str_buf;
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const char *end;
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int i = 0;
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if (isdigit(*str)) {
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/* No device name given, use default driver mem */
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sprintf(buf, "mem");
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end = str;
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} else {
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/* OK, we have a device name, parse it */
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while (*str) {
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if (*str == ':') {
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str++;
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buf[i] = 0;
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break;
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}
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buf[i++] = *str++;
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buf[i] = 0;
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if (i == MAX_DRIVER_NAME)
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return NULL;
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}
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end = str;
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}
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if (endp)
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*endp = (char *)end;
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return buf;
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}
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/* Get a device struct from the beginning of the string. Default to mem if no
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* device is given, return NULL if a unknown device is given.
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* If endp is not NULL, this function stores a pointer to the first character
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* after the device name in *endp.
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*/
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struct device_d *device_from_spec_str(const char *str, char **endp)
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{
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char *name;
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name = deviceid_from_spec_str(str, endp);
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return get_device_by_id(name);
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}
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/* Get devices from their type.
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* If last is NULL the first device of this type is given.
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* If last is not NULL, the next device of this type starting
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* from last is given.
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*/
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struct device_d *get_device_by_type(ulong type, struct device_d *last)
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{
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struct device_d *dev;
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if (!last)
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dev = first_device;
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else
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dev = last->next;
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while (dev) {
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if (dev->type == type)
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return dev;
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dev = dev->next;
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}
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return NULL;
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}
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ssize_t dev_read(struct device_d *dev, void *buf, size_t count, unsigned long offset, ulong flags)
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{
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if (dev->driver->read)
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return dev->driver->read(dev, buf, count, offset, flags);
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errno = -ENOSYS;
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return -ENOSYS;
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}
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ssize_t dev_write(struct device_d *dev, const void *buf, size_t count, unsigned long offset, ulong flags)
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{
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if (dev->driver->write)
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return dev->driver->write(dev, buf, count, offset, flags);
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errno = -ENOSYS;
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return -ENOSYS;
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}
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ssize_t dev_erase(struct device_d *dev, size_t count, unsigned long offset)
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{
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if (dev->driver->erase)
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return dev->driver->erase(dev, count, offset);
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errno = -ENOSYS;
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return -ENOSYS;
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}
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int dummy_probe(struct device_d *dev)
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{
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return 0;
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}
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int do_devinfo ( cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
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{
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struct device_d *dev = first_device;
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struct driver_d *drv = first_driver;
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struct param_d *param;
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if (argc == 1) {
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printf("devices:\n");
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while(dev) {
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printf("%10s: base=0x%08x size=0x%08x (driver %s)\n",
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dev->id, dev->map_base, dev->size, dev->driver ? dev->driver->name : "none");
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dev = dev->next;
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}
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printf("drivers:\n");
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while(drv) {
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printf("%10s\n",drv->name);
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drv = drv->next;
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}
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} else {
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struct device_d *dev = get_device_by_id(argv[1]);
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if (!dev) {
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printf("no such device: %s\n",argv[1]);
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return -1;
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}
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if (dev->driver)
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dev->driver->info(dev);
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param = dev->param;
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printf("%s\n", param ? "Parameters:" : "no parameters available");
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while (param) {
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printf("%16s = %s\n", param->name, param->value);
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param = param->next;
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}
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}
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return 0;
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}
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static __maybe_unused char cmd_devinfo_help[] =
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"Usage: devinfo [DEVICE]\n"
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"If called without arguments devinfo shows a summary about known devices and\n"
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"drivers. If called with a device id as argument devinfo shows more detailed\n"
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"informations about this device and its parameters.\n";
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U_BOOT_CMD_START(devinfo)
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.maxargs = 2,
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.cmd = do_devinfo,
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.usage = "display info about devices and drivers",
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U_BOOT_CMD_HELP(cmd_devinfo_help)
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U_BOOT_CMD_END
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